Abstract
Hierarchical niobic acid (Nb2O5·nH2O) microflowers are synthesized by a surfactant-free hydrothermal approach. The three-dimensional microflowers are assembled from two-dimensional ultrathin nanosheets with thickness of ∼5nm. Using rhodamine B as a probe, the Nb2O5·nH2O microflowers exhibit high photocatalytic activity under UV light irradiation. Furthermore, the Nb2O5·nH2O microflowers are easily converted to niobium pentoxide without significant structural alteration.
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